End-Friction Effect on Concrete Cubes with Passive Confinement
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 8
Abstract
True-triaxial test data are fundamental in obtaining the constitutive laws of fiber-reinforced polymer (FRP)—confined concrete, especially concrete under nonuniform (passive) confinement. A new true-triaxial test system, which exerts passive confinement on concrete cubes, has been developed by the authors to fill the passive confinement gap in existing tests. To obtain true constitutive behavior from cube testing, it is essential to resolve the end-friction effect. In this study, the design of a friction reduction pad with polytetrafluoroethylene (PTFE) sheets was investigated, and a quantitative analysis was carried out to determine the pad’s friction reduction performance. Moreover, an equivalent confinement method was proposed to quantify pad performance under different pad configurations. The results demonstrate that a two-ply greased PTFE pad works efficiently for concrete under uniaxial compression. However, it does not prevent end friction from regenerating in the strain-hardening stage in passively confined concrete. The equivalent confinement method was further developed to quantify the regenerated end-friction effect and to obtain the inherent constitutive behavior of concrete under uniform passive confinement in a true-triaxial test system. This study is the first quantitative investigation of friction reduction performance specifically for concrete cubes with strain-hardening behavior.
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Acknowledgments
The work described in this paper was fully supported by the National Natural Science Foundation of China (Grant No. 51308404) and the Fundamental Research Funds for the Central Universities, China. The authors would also like to acknowledge the suggestions provided by Professor Kent A. Harries.
References
BSI (British Standards Institution). 2008. Code of practice for temporary works procedures and the permissible stress design of falsework. BS 5975:2008+A1:2011. London, UK: BSI.
Candappa, D., J. Sanjayan, and S. Setunge. 2001. “Complete triaxial stress-strain curves of high-strength concrete.” J. Mater. Civ. Eng. 13 (3): 209–215. https://doi.org/10.1061/(ASCE)0899-1561(2001)13:3(209).
Dai, J. G., Y. L. Bai, and J. G. Teng. 2011. “Behavior and modeling of concrete confined with FRP composites of large deformability.” J. Compos. Constr. 15 (6): 963–973. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000230.
Du, X. L., D. C. Lu, Q. M. Gong, and M. Zhao. 2009. “Nonlinear unified strength criterion for concrete under three-dimensional stress states.” J. Eng. Mech. 136 (1): 51–59. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000055.
Fardis, M. N., B. Alibe, and J. L. Tassoulas. 1983. “Monotonic and cyclic constitutive law for concrete.” J. Eng. Mech. 109 (2): 516–536. https://doi.org/10.1061/(ASCE)0733-9399(1983)109:2(516).
He, Z. J., and J. X. Zhang. 2014. “Strength characteristics and failure criterion of plain recycled aggregate concrete under triaxial stress states.” Constr. Build. Mater. 54: 354–362. https://doi.org/10.1016/j.conbuildmat.2013.12.075.
Hobbs, D. W., C. D. Pomeroy, and J. B. Newman. 1977. “Design stresses for concrete structures subjected to multi-axial stresses.” Struct. Eng. 55 (4): 151–164.
Hu, Y. M., T. Yu, and J. G. Teng. 2011. “FRP-confined circular concrete-filled thin steel tubes under axial compression.” J. Compos. Constr. 15 (5): 850–860. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000217.
Jiang, J. F., and Y. F. Wu. 2012. “Identification of material parameters for Drucker-Prager plasticity model for FRP confined circular concrete columns.” Int. J. Solid. Struct. 49 (3–4): 445–456. https://doi.org/10.1016/j.ijsolstr.2011.10.002.
Jiang, J. F., and Y. F. Wu. 2014. “Characterization of yield surfaces for FRP-confined concrete.” J. Eng. Mech. 140 (12): 04014096. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000811.
Jiang, J. F., and Y. F. Wu. 2016. “Plasticity-based criterion for confinement design of FRP jacketed concrete columns.” Mater. Struct. 49 (6): 2035–2051. https://doi.org/10.1617/s11527-015-0632-4.
Jiang, J. F., P. C. Xiao, and B. B. Li. 2017. “A novel triaxial test system for concrete under passive confinement.” J. Test. Eval. 46 (3): 0160547. https://doi.org/10.1520/JTE20160547.
Jiang, T., and J. G. Teng. 2007. “Analysis-oriented stress-strain models for FRP-confined concrete.” Eng. Struct. 29 (11): 2968–2986. https://doi.org/10.1016/j.engstruct.2007.01.010.
Karabinis, A. I., and T. C. Rousakis. 2002. “Concrete confined by FRP material: A plasticity approach.” Eng. Struct. 24 (7): 923–932. https://doi.org/10.1016/S0141-0296(02)00011-1.
Koh, C. G., M. Q. Teng, and T. H. Wee. 2008. “A plastic-damage model for lightweight concrete and normal weight concrete.” Int. J. Concr. Struct. Mater. 2 (2): 123–136. https://doi.org/10.4334/IJCSM.2008.2.2.123.
Kotsovos, M. 1983. “Effect of testing techniques on the post-ultimate behaviour of concrete in compression.” Mater. Constr. 16 (1): 3–12. https://doi.org/10.1007/BF02474861.
Kotsovos, M., and S. Perry. 1986. “Behaviour of concrete subjected to passive confinement.” Mater. Struct. 19 (4): 259–264. https://doi.org/10.1007/BF02472108.
Kupfer, H., H. K. Hilsdorf, and H. Rusch. 1969. “Behavior of concrete under biaxial stresses.” J. Proc. 66 (8): 656–666.
Lam, L., and J. G. Teng. 2004. “Ultimate condition of fiber reinforced polymer-confined concrete.” J. Compos. Constr. 8 (6): 539–548. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:6(539).
Lamond, J. F., and J. H. Pielert. 2006. Significance of tests and properties of concrete and concrete-making materials. West Conshohocken, PA: ASTM.
Launay, P., and H. Gachon. 1972. “Strain and ultimate strength of concrete under triaxial stress.” Spec. Publ. 34: 269–282.
Lim, J. C., and T. Ozbakkaloglu. 2014. “Investigation of the influence of the application path of confining pressure: Tests on actively confined and FRP-confined concretes.” J. Struct. Eng. 141 (8): 04014203. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001177.
Lim, J. C., and T. Ozbakkaloglu. 2015a. “Lateral strain-to-axial strain relationship of confined concrete.” J. Struct. Eng. 141 (5): 04014141. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001094.
Lim, J. C., and T. Ozbakkaloglu. 2015b. “Unified stress-strain model for FRP and actively confined normal-strength and high-strength concrete.” J. Compos. Constr. 19 (4): 04014072. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000536.
Mirmiran, A., and M. Shahawy. 1997. “Dilation characteristics of confined concrete.” Mech. Cohes. Frict. Mater. 2 (3): 237–249. https://doi.org/10.1002/(SICI)1099-1484(199707)2:3%3C237::AID-CFM32%3E3.0.CO;2-2.
Mohsen, M., and Y. F. Wu. 2017. “Triaxial test for concrete under non-uniform passive confinement.” Constr. Build. Mater. 138: 455–468. https://doi.org/10.1016/j.conbuildmat.2017.02.032.
Popovics, S. 1973. “A numerical approach to the complete stress-strain curve of concrete.” Cement Concr. Res. 3 (5): 583–599. https://doi.org/10.1016/0008-8846(73)90096-3.
Seow, P. E. C., and S. Swaddiwudhipong. 2005. “Failure surface for concrete under multiaxial load—A unified approach.” J. Mater. Civ. Eng. 17 (2): 219–228. https://doi.org/10.1061/(ASCE)0899-1561(2005)17:2(219).
Shang, H. S., Y. P. Song, and L. K. Qin. 2008. “Experimental study on strength and deformation of plain concrete under triaxial compression after freeze-thaw cycles.” Build. Environ. 43 (7): 1197–1204. https://doi.org/10.1016/j.buildenv.2006.08.027.
Teng, J. G., T. Yu, Y. L. Wong, and S. L. Dong. 2007. “Hybrid FRP-concrete-steel tubular columns: Concept and behavior.” Constr. Build. Mater. 21 (4): 846–854.
Van Mier, J., et al. 1997. “Strain-softening of concrete in uniaxial compression.” Mater. Struct. 30 (4): 195–209. https://doi.org/10.1007/BF02486177.
Van Vliet, M., and J. Van Mier. 1996. “Experimental investigation of concrete fracture under uniaxial compression.” Mech. Cohes. Frict. Mater. 1 (1): 115–127. https://doi.org/10.1002/(SICI)1099-1484(199601)1:1%3C115::AID-CFM6%3E3.0.CO;2-U.
Wang, C. Z., Z. H. Guo, and X. Q. Zhang. 1987. “Experimental investigation of biaxial and triaxial compressive concrete strength.” Mater. J. 84 (2): 92–100.
Wang, L. C., and Y. P. Song. 2015. “Mechanical behavior and failure criterion of the gangue-based haydite concrete under triaxial loading.” Mater. Struct. 48 (5): 1419–1433. https://doi.org/10.1617/s11527-013-0243-x.
Wei, Y. Y., and Y. F. Wu. 2012. “Unified stress-strain model of concrete for FRP-confined columns.” Constr. Build. Mater. 26 (1): 381–392. https://doi.org/10.1016/j.conbuildmat.2011.06.037.
Wu, Y. F., and J. F. Jiang. 2013. “Effective strain of FRP for confined circular concrete columns.” Compos. Struct. 95: 479–491. https://doi.org/10.1016/j.compstruct.2012.08.021.
Xiao, Q. G., J. G. Teng, and T. Yu. 2010. “Behavior and modeling of confined high-strength concrete.” J. Compos. Constr. 14 (3): 249–259. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000070.
Xiong, H. B., B. B. Li, and J. F. Jiang. 2016. “Load path dependence of strain and stress for confined concrete.” Mag. Concr. Res. 68 (12): 604–618. https://doi.org/10.1680/jmacr.15.00175.
Yu, T., J. G. Teng, Y. L. Wong, and S. L. Dong. 2010. “Finite element modeling of confined concrete. I: Drucker-Prager type plasticity model.” Eng. Struct. 32 (3): 665–679. https://doi.org/10.1016/j.engstruct.2009.11.014.
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©2018 American Society of Civil Engineers.
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Received: Mar 23, 2017
Accepted: Jan 12, 2018
Published online: Jun 9, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 9, 2018
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